Electroweak Tests of the Standard Model
Jens Erler (IF-UNAM) PASCOS 2012 — Mérida, Yuc. (Mexico) June 7, 2012
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Electroweak Tests of the Standard Model Jens Erler (IF-UNAM) PASCOS - - PowerPoint PPT Presentation
Electroweak Tests of the Standard Model Jens Erler (IF-UNAM) PASCOS 2012 Mrida, Yuc. (Mexico) June 7, 2012 1 Electroweak Tests of the Standard Model found anything? Jens Erler (IF-UNAM) PASCOS 2012 Mrida, Yuc.
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1970s: discovery of key predictions of the SM (neutral currents, APV, polarized DIS)
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1970s: discovery of key predictions of the SM (neutral currents, APV, polarized DIS) 1980s: establishment of basic structure of the SM (mutually consistent values of sin2θW = g′2∕(g2 + g′2) from many different processes)
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1970s: discovery of key predictions of the SM (neutral currents, APV, polarized DIS) 1980s: establishment of basic structure of the SM (mutually consistent values of sin2θW = g′2∕(g2 + g′2) from many different processes) 1990s (LEP , SLC): confirmation of the SM at the loop level ⇒ new physics at most a perturbation
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1970s: discovery of key predictions of the SM (neutral currents, APV, polarized DIS) 1980s: establishment of basic structure of the SM (mutually consistent values of sin2θW = g′2∕(g2 + g′2) from many different processes) 1990s (LEP , SLC): confirmation of the SM at the loop level ⇒ new physics at most a perturbation 2000s (Tevatron): ultra-high precision in mt (0.5%) and MW (2×10-4) ⇒ (most of) new physics seperated by at least a little hierarchy (or else conspiracy)
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1970s: discovery of key predictions of the SM (neutral currents, APV, polarized DIS) 1980s: establishment of basic structure of the SM (mutually consistent values of sin2θW = g′2∕(g2 + g′2) from many different processes) 1990s (LEP , SLC): confirmation of the SM at the loop level ⇒ new physics at most a perturbation 2000s (Tevatron): ultra-high precision in mt (0.5%) and MW (2×10-4) ⇒ (most of) new physics seperated by at least a little hierarchy (or else conspiracy) 2010s (LHC, intensity frontier): electroweak symmetry breaking sector
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sin2θWon-shell ≡ 1 − MW2∕MZ2 = 0.2277 ± 0.0016
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sin2θWon-shell ≡ 1 − MW2∕MZ2 = 0.2277 ± 0.0016 SM: sin2θW = 0.22296 ± 0.00028 (3.0 σ deviation)
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sin2θWon-shell ≡ 1 − MW2∕MZ2 = 0.2277 ± 0.0016 SM: sin2θW = 0.22296 ± 0.00028 (3.0 σ deviation) deviation sits in gL2 (2.7 σ)
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sin2θWon-shell ≡ 1 − MW2∕MZ2 = 0.2277 ± 0.0016 SM: sin2θW = 0.22296 ± 0.00028 (3.0 σ deviation) deviation sits in gL2 (2.7 σ) various SM effects have been suggested: asymmetric strange sea isospin violation (QED splitting effects Glück, Jimenez-Delgado, Reya 2005 and PDFs
Sather 1992; Rodionov, Thomas, Londergan 1994; Martin et al. 2004)
nuclear effects (e.g., isovector EMC effect Cloët, Bentz, Thomas 2009) QED Arbuzov, Bardin, Kalinovskaya 2005; Park, Baur, Wackeroth 2009, Diener, Dittmaier, Hollik 2004 QCD Dobrescu, Ellis 2004 and EW Diener, Dittmaier, Hollik 2005 radiative corrections
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sin2θWon-shell ≡ 1 − MW2∕MZ2 = 0.2277 ± 0.0016 SM: sin2θW = 0.22296 ± 0.00028 (3.0 σ deviation) deviation sits in gL2 (2.7 σ) various SM effects have been suggested: asymmetric strange sea isospin violation (QED splitting effects Glück, Jimenez-Delgado, Reya 2005 and PDFs
Sather 1992; Rodionov, Thomas, Londergan 1994; Martin et al. 2004)
nuclear effects (e.g., isovector EMC effect Cloët, Bentz, Thomas 2009) QED Arbuzov, Bardin, Kalinovskaya 2005; Park, Baur, Wackeroth 2009, Diener, Dittmaier, Hollik 2004 QCD Dobrescu, Ellis 2004 and EW Diener, Dittmaier, Hollik 2005 radiative corrections situation not conclusive; breaking news @CIPANP: Bob Bernstein confirms that NuTeV fitting functions were applied correctly by Cloët et al.
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MW = 80.387 ± 0.016 GeV CDF & D0 2012 (±19 MeV CDF 2.2 fb−1)
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MW = 80.387 ± 0.016 GeV CDF & D0 2012 (±19 MeV CDF 2.2 fb−1) MW = 80.376 ± 0.033 GeV LEP 2 ⇒ sin2θWon-shell ≡ 1 − MW2∕MZ2 = 0.22290 ± 0.00028 ⇒ sin2θWeff = 0.23141 ± 0.00013 and MH = 96+29−25 GeV
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MW = 80.387 ± 0.016 GeV CDF & D0 2012 (±19 MeV CDF 2.2 fb−1) MW = 80.376 ± 0.033 GeV LEP 2 ⇒ sin2θWon-shell ≡ 1 − MW2∕MZ2 = 0.22290 ± 0.00028 ⇒ sin2θWeff = 0.23141 ± 0.00013 and MH = 96+29−25 GeV new global electroweak fit: MH = 102+24−20 GeV JE 2012
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MW = 80.387 ± 0.016 GeV CDF & D0 2012 (±19 MeV CDF 2.2 fb−1) MW = 80.376 ± 0.033 GeV LEP 2 ⇒ sin2θWon-shell ≡ 1 − MW2∕MZ2 = 0.22290 ± 0.00028 ⇒ sin2θWeff = 0.23141 ± 0.00013 and MH = 96+29−25 GeV new global electroweak fit: MH = 102+24−20 GeV JE 2012 prospects for 10 fb−1: no PDF (±10 MeV) & QED (±4 MeV) improvement ⇒ ±13 MeV CDF most optimistic scenario ⇒ ±10 MeV CDF
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mt = 173.4 ± 0.9exp ± 0.5th GeV
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mt = 173.4 ± 0.9exp ± 0.5th GeV Question: What is the definition of mt? Correct but useless answer: mt ≡ mtPythia (“Pythia tuning parameter”) We assume mtPythia = mtpole ± ΛQCD where mtpole ≡ m̅t(m̅t) [1 + 4∕3 αs(m̅t)∕π + O(αs2) + O(αs3)] and ΛQCD ≡ the O(αs3) term above (see also Skands, Wicke 2007)
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mt = 173.4 ± 0.9exp ± 0.5th GeV Question: What is the definition of mt? Correct but useless answer: mt ≡ mtPythia (“Pythia tuning parameter”) We assume mtPythia = mtpole ± ΛQCD where mtpole ≡ m̅t(m̅t) [1 + 4∕3 αs(m̅t)∕π + O(αs2) + O(αs3)] and ΛQCD ≡ the O(αs3) term above (see also Skands, Wicke 2007) Alternative I: SCET + HQET → “jet mass” Fleming, Hoang, Mantry, Stewart 2008
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mt = 173.4 ± 0.9exp ± 0.5th GeV Question: What is the definition of mt? Correct but useless answer: mt ≡ mtPythia (“Pythia tuning parameter”) We assume mtPythia = mtpole ± ΛQCD where mtpole ≡ m̅t(m̅t) [1 + 4∕3 αs(m̅t)∕π + O(αs2) + O(αs3)] and ΛQCD ≡ the O(αs3) term above (see also Skands, Wicke 2007) Alternative I: SCET + HQET → “jet mass” Fleming, Hoang, Mantry, Stewart 2008 Alternative II: get m̅t(m̅t) directly from t t ̅ cross-section ⇒ m̅t(m̅t) = 160.0 ± 3.3 GeV Langenfeld, Moch, Uwer 2008 ⇒ MH = 81+32−24 GeV (mtpole = 169.6 ± 3.5 GeV)
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mt [GeV]
80.30 80.35 80.40 80.45
MW [GeV]
direct (1σ) indirect (1σ) all precision data (90%) allowed by Higgs searches excluded by 1 experiment excluded by > 1 experiment
JE 2012
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0.0001 0.001 0.01 0.1 1 10 100 1000 10000
[GeV]
0.228 0.23 0.232 0.234 0.236 0.238 0.24 0.242 0.244 0.246 0.248 0.25
sin
2W()
Q Q
W
QW (Ra) (Cs)
SLAC E158
W(e)
QWeak QWeak
NuTeV
LEP 1 SLC Tevatron CMS
SOLID MOLLER
JLab JLab Mainz KVI Boulder JLab
PVDIS 6 GeV
JLab screening anti-screening
SM published
proposed
Z
W Z
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Qweak: measurement of QW(p) ~ 1 − 4 sin2θW to 4% in elastic polarized e− p scattering data taking completed similar quantity as weak charges measured in APV, but different kinematics ⇒ re-enhancement of γ-Z box also at MESA in Mainz? (if not then MAMI)
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Qweak: measurement of QW(p) ~ 1 − 4 sin2θW to 4% in elastic polarized e− p scattering data taking completed similar quantity as weak charges measured in APV, but different kinematics ⇒ re-enhancement of γ-Z box also at MESA in Mainz? (if not then MAMI) MOLLER: ultra-high precision sin2θW measurement in polarized e− e− scattering at 12 GeV CEBAF improvement over SLAC-E158 by factor of 5
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Qweak: measurement of QW(p) ~ 1 − 4 sin2θW to 4% in elastic polarized e− p scattering data taking completed similar quantity as weak charges measured in APV, but different kinematics ⇒ re-enhancement of γ-Z box also at MESA in Mainz? (if not then MAMI) MOLLER: ultra-high precision sin2θW measurement in polarized e− e− scattering at 12 GeV CEBAF improvement over SLAC-E158 by factor of 5 PVDIS and SOLID: array of kinematics points to test strong, EW & new physics
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Qweak: measurement of QW(p) ~ 1 − 4 sin2θW to 4% in elastic polarized e− p scattering data taking completed similar quantity as weak charges measured in APV, but different kinematics ⇒ re-enhancement of γ-Z box also at MESA in Mainz? (if not then MAMI) MOLLER: ultra-high precision sin2θW measurement in polarized e− e− scattering at 12 GeV CEBAF improvement over SLAC-E158 by factor of 5 PVDIS and SOLID: array of kinematics points to test strong, EW & new physics JLab 12 GeV upgrade
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0.0001 0.001 0.01 0.1 1 10 100 1000 10000
[GeV]
0.228 0.23 0.232 0.234 0.236 0.238 0.24 0.242 0.244 0.246 0.248 0.25
sin
2W()
Q Q
W
QW (Ra) (Cs)
SLAC E158
W(e)
QWeak QWeak
NuTeV
LEP 1 SLC Tevatron CMS
SOLID MOLLER
JLab JLab Mainz KVI Boulder JLab
PVDIS 6 GeV
JLab screening anti-screening
SM published
proposed
Z
W Z
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. 1 6 . 1 8 . 2 . 2 2 . 2 4 . 2 6
QWHThL QWHCsL Bates eC SLAC eD Mainz e Be PVES
0.10 0.12 0.14 0.16 0.18
C1 u-C1 d C1 u+C1 d
nm HnmL e nee nee
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
0.0 0.5 1.0
0.0 0.5 1.0
gA
ne
gV
ne
☞ talk on LENA by Estela Garces tuesday
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aμ ≡ (1165920.80 ± 0.63)×10−9 BNL-E821 2004 SM: aμ ≡ (1165918.41 ± 0.48)×10−9 3.0 σ deviation (includes e+e− and τ-decay data) e+e− based (annihilation and radiative return): 3.6 σ τ based: 2.4 σ 2.3 σ discrepancy between experimental B(τ− → ν π0 π−) and prediction from e+e− and CVC but also 1.9 σ conflict between KLOE and BaBar (which is not inconsistent with τ-data) new physics (SUSY)? Personally, I am less concerned about the hadronic issues than the absence of BSM hints at the Tevatron/LHC
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JE 2012
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JE 2012
10 100 1000 10000
MH [GeV]
0.23 0.231 0.232 0.233 0.234 0.235
sin
2θe eff
E158 ALR(had) AFB(b) APV (Cs) MOLLER
JE 2012
28
Higgs boson mass (GeV)
100 200 300 400 500 600
SM
σ / σ Best fit
0.0 0.5 1.0 1.5 2.0 2.5
68% CL band 68% CL band
L = 4.6-4.8 fb = 7 TeV s CMS, 68% CL band
L = 4.6-4.8 fb = 7 TeV s CMS, 29
10 20 30 40 50 106 108 110 112 114 116 118 120
mH(GeV/c2)
Observed Expected for background Expected for signal plus background
LEP
[GeV]
H
m 100 200 300 400 500 600 Signal strength
0.5 1 1.5 2 2.5 Best fit ) < 1 µ (
= 7 TeV s
Ldt = 4.6-4.9 fb
2011 Data
29
100 125 150 200 250 300 400 500 600 800 700
MH [GeV]
1 4 9 16 25 36 49 64 81
Δχ
2
all data
100 125 150 200 250 300 400 500 600 800 700
MH [GeV]
4 1 9 16 25 36 49 64 81
Δχ
2
all data except electroweak precision
30
30
31
Higgs boson mass (GeV)
110 115 120 125 130 135 140 145
SM
σ / σ Best fit
0.0 0.5 1.0 1.5 2.0 2.5
68% CL band 68% CL band
L = 4.6-4.8 fb = 7 TeV s CMS,
[GeV]
H
m 110 115 120 125 130 135 140 145 150 Signal strength
0.5 1 1.5 2 2.5 Best fit ) < 1 µ (
= 7 TeV s
Ldt = 4.6-4.9 fb
2011 Data
110 115 120 125 130 135 140 145 150 155 160
Local p-value
10
10
10
10 1
σ 1 σ 2 σ 3 σ 4
= 4.6-4.7 fb
int
= 7 TeV, Combined, L s CMS Preliminary, Interpretation requires look-elsewhere effect correction
)
2
Higgs boson mass (GeV/c
110 115 120 125 130 135 140 145 150 155 160
SM
σ / σ Best fit
1 from fit σ 1 ± from fit σ 1 ±
[GeV]
H
M 110 115 120 125 130 135 140 145 150 Signal strength
0.5 1 1.5 2 2.5 Best fit
± = 7 TeV s
Ldt = 1.0-4.9 fb
2011 Data
31
32
32
p(MH) ≡ exp[−χ2EW(MH)∕2] QLEP QTevatron QLHC MH-1 factorized form: neglect of correlations
32
32
p(MH) ≡ exp[−χ2EW(MH)∕2] QLEP QTevatron QLHC MH-1 factorized form: neglect of correlations QLEP(MH), QTevatron(MH): likelihood ratios H∕H+B
32
32
p(MH) ≡ exp[−χ2EW(MH)∕2] QLEP QTevatron QLHC MH-1 factorized form: neglect of correlations QLEP(MH), QTevatron(MH): likelihood ratios H∕H+B QLHC(MH) = QATLAS(MH) QCMS(MH) (but not available) instead: 2 ln Q ≡ χ2H+B(MH) − χ2B(MH) ≡ (1 − σ̅obs)2∕Δσ̅+2 − σ̅obs2∕Δσ̅−2
32
32
p(MH) ≡ exp[−χ2EW(MH)∕2] QLEP QTevatron QLHC MH-1 factorized form: neglect of correlations QLEP(MH), QTevatron(MH): likelihood ratios H∕H+B QLHC(MH) = QATLAS(MH) QCMS(MH) (but not available) instead: 2 ln Q ≡ χ2H+B(MH) − χ2B(MH) ≡ (1 − σ̅obs)2∕Δσ̅+2 − σ̅obs2∕Δσ̅−2 σ̅obs: eff. observed X-section (signal strength) combining all channels
32
32
p(MH) ≡ exp[−χ2EW(MH)∕2] QLEP QTevatron QLHC MH-1 factorized form: neglect of correlations QLEP(MH), QTevatron(MH): likelihood ratios H∕H+B QLHC(MH) = QATLAS(MH) QCMS(MH) (but not available) instead: 2 ln Q ≡ χ2H+B(MH) − χ2B(MH) ≡ (1 − σ̅obs)2∕Δσ̅+2 − σ̅obs2∕Δσ̅−2 σ̅obs: eff. observed X-section (signal strength) combining all channels Δσ̅±: error pointing in signal (+) and background (−) direction
32
32
p(MH) ≡ exp[−χ2EW(MH)∕2] QLEP QTevatron QLHC MH-1 factorized form: neglect of correlations QLEP(MH), QTevatron(MH): likelihood ratios H∕H+B QLHC(MH) = QATLAS(MH) QCMS(MH) (but not available) instead: 2 ln Q ≡ χ2H+B(MH) − χ2B(MH) ≡ (1 − σ̅obs)2∕Δσ̅+2 − σ̅obs2∕Δσ̅−2 σ̅obs: eff. observed X-section (signal strength) combining all channels Δσ̅±: error pointing in signal (+) and background (−) direction Poisson statistics ⇒ Δσ̅+ > Δσ̅− but often also Δσ̅+ < Δσ̅−
32
32
110 115 120 125 130 135
MH [GeV]
1 2 3 4 5 6
% probability per 0.1 GeV bin
33
JE 2012
33
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
35
105 110 115 120 125 130 135 140
MH [GeV]
0.02 0.04 0.06 0.08 0.1 0.12 0.14
probability per 0.1 GeV
all data except LHC Gaussian: MH = 119.0 ± 4.5 GeV
115 120 125 130
MH [GeV]
0.02 0.04 0.06 0.08 0.10 0.12 0.14
probability per 0.1 GeV
all data except CMS Gaussian: MH = 125.8 ± 1.3 GeV
115 120 125 130
MH [GeV]
0.02 0.04 0.06 0.08 0.10 0.12 0.14
probability per 0.1 GeV
all data except ATLAS Gaussian: MH = 124.3 ± 1.1 GeV
115 120 125 130
MH [GeV]
0.02 0.04 0.06 0.08 0.10 0.12 0.14
probability per 0.1 GeV
all data Gaussian: MH = 124.8 ± 0.7 GeV
35
36
37
JE 2012
0.5 1.0 1.5
S
0.5 1.0
T
MH = 600 GeV MH = 124.8 GeV
all (90% CL) all (90% CL) ΓZ, σhad, Rl, Rq asymmetries MW ν scattering e scattering APV Cs (0.48%)
JE 2012
37
38
JE 2012
0.5 1.0 1.5
S
0.5 1.0
T
MH = 600 GeV MH = 124.8 GeV
all (90% CL) all (90% CL) ΓZ, σhad, Rl, Rq asymmetries MW ν scattering e scattering APV Cs (0.48%) APV Ra
+ (0.1%)
JE 2012
38
39
SM4 Higgs boson mass (GeV)
110 115 120 125 130 135 140 145
SM4
σ / σ 95% CL limit on
10 1 10
2
10
Combined )
bb (4.7 fb → H )
(4.6 fb τ τ → H )
(4.8 fb γ γ → H )
WW (4.6 fb → H )
ZZ (4.7 fb → H
CMS Preliminary = 7 TeV s
L = 4.6-4.8 fb
Combined )
bb (4.7 fb → H )
(4.6 fb τ τ → H )
(4.8 fb γ γ → H )
WW (4.6 fb → H )
ZZ (4.7 fb → H
39
if Higgs hint is real, an extra fermion generation is ruled out (99.6% CL) Kuflik, Nir, Volansky 2012
39
SM4 Higgs boson mass (GeV)
110 115 120 125 130 135 140 145
SM4
σ / σ 95% CL limit on
10 1 10
2
10
Combined )
bb (4.7 fb → H )
(4.6 fb τ τ → H )
(4.8 fb γ γ → H )
WW (4.6 fb → H )
ZZ (4.7 fb → H
CMS Preliminary = 7 TeV s
L = 4.6-4.8 fb
Combined )
bb (4.7 fb → H )
(4.6 fb τ τ → H )
(4.8 fb γ γ → H )
WW (4.6 fb → H )
ZZ (4.7 fb → H
39
if Higgs hint is real, an extra fermion generation is ruled out (99.6% CL) Kuflik, Nir, Volansky 2012 3 scenarios (all need some tuning & faith; mass spectra generally similar) MH ≲ 120 GeV e.g., Dighe, Ghosh,
Godbole, Prasath 2012
MH ≳ 450 GeV
Buchkremer, Gérard, Maltoni 2012
MH ≈ 125 GeV + physics beyond 4G. Example: 2HD4G
Bellantoni, Heckman, JE 2012
39
SM4 Higgs boson mass (GeV)
110 115 120 125 130 135 140 145
SM4
σ / σ 95% CL limit on
10 1 10
2
10
Combined )
bb (4.7 fb → H )
(4.6 fb τ τ → H )
(4.8 fb γ γ → H )
WW (4.6 fb → H )
ZZ (4.7 fb → H
CMS Preliminary = 7 TeV s
L = 4.6-4.8 fb
Combined )
bb (4.7 fb → H )
(4.6 fb τ τ → H )
(4.8 fb γ γ → H )
WW (4.6 fb → H )
ZZ (4.7 fb → H
39
40
1
1
x x x
Zψ
x x x x
MOLLER PVDIS
ZR1 ZI ZR Z χ Zη ZN ZS
x xZd
/
xZL1 xZp
/
xZB-L x
ZLR
x
Zn
/
ZALR
x
Y
x x
Zu-int
+
QW(H)
x
QW(Cs) E158
ZL
/
MZ’ = 1.2 TeV
40
41
0.001 0.002
0.001 0.002 ∆CKM ∆e/µ
Bauman, JE, Ramsey-Musolf 2012
41
42
43
115 120 125 130
MH [GeV]
0.02 0.04 0.06 0.08 0.10 0.12 0.14
probability per 0.1 GeV
all data Gaussian: MH = 124.8 ± 0.7 GeV
43
Precision tests have reached per-mille and sub per-mille accuracy in derived quantities.
43
115 120 125 130
MH [GeV]
0.02 0.04 0.06 0.08 0.10 0.12 0.14
probability per 0.1 GeV
all data Gaussian: MH = 124.8 ± 0.7 GeV
43
Precision tests have reached per-mille and sub per-mille accuracy in derived quantities. Precision data in very good agreement with the SM ⇒ tight constraints on new physics.
43
115 120 125 130
MH [GeV]
0.02 0.04 0.06 0.08 0.10 0.12 0.14
probability per 0.1 GeV
all data Gaussian: MH = 124.8 ± 0.7 GeV
43
Precision tests have reached per-mille and sub per-mille accuracy in derived quantities. Precision data in very good agreement with the SM ⇒ tight constraints on new physics. When combined with the absence of BSM signals at the LHC ⇒ more and more likely that new physics is separted from the SM by at least a little hierarchy.
43
115 120 125 130
MH [GeV]
0.02 0.04 0.06 0.08 0.10 0.12 0.14
probability per 0.1 GeV
all data Gaussian: MH = 124.8 ± 0.7 GeV
43
Precision tests have reached per-mille and sub per-mille accuracy in derived quantities. Precision data in very good agreement with the SM ⇒ tight constraints on new physics. When combined with the absence of BSM signals at the LHC ⇒ more and more likely that new physics is separted from the SM by at least a little hierarchy. Only tantalizing deviation is in gμ−2.
43
115 120 125 130
MH [GeV]
0.02 0.04 0.06 0.08 0.10 0.12 0.14
probability per 0.1 GeV
all data Gaussian: MH = 124.8 ± 0.7 GeV
43
Precision tests have reached per-mille and sub per-mille accuracy in derived quantities. Precision data in very good agreement with the SM ⇒ tight constraints on new physics. When combined with the absence of BSM signals at the LHC ⇒ more and more likely that new physics is separted from the SM by at least a little hierarchy. Only tantalizing deviation is in gμ−2. Within SM, Higgs searches + EW precision data give the LHC/Tevatron Higgs hints a 3 ½ σ significance (no need for look-elsewhere effect correction).
43
115 120 125 130
MH [GeV]
0.02 0.04 0.06 0.08 0.10 0.12 0.14
probability per 0.1 GeV
all data Gaussian: MH = 124.8 ± 0.7 GeV
43
Precision tests have reached per-mille and sub per-mille accuracy in derived quantities. Precision data in very good agreement with the SM ⇒ tight constraints on new physics. When combined with the absence of BSM signals at the LHC ⇒ more and more likely that new physics is separted from the SM by at least a little hierarchy. Only tantalizing deviation is in gμ−2. Within SM, Higgs searches + EW precision data give the LHC/Tevatron Higgs hints a 3 ½ σ significance (no need for look-elsewhere effect correction). Not confirming the LHC Higgs hint would be a much bigger deal than discovering it
43
115 120 125 130
MH [GeV]
0.02 0.04 0.06 0.08 0.10 0.12 0.14
probability per 0.1 GeV
all data Gaussian: MH = 124.8 ± 0.7 GeV
43
44
45
SM
σ / σ Best fit
0.5 1 1.5 2 2.5 3 4l → ZZ → H WW → H γ γ → H τ τ → H bb → H
L = 4.6-4.8 fb = 7 TeV s CMS,
= 124 GeV
H
m Combined (68%) Single channel
SM
σ / σ Best fit
0.5 1 1.5 2 2.5 3 3.5 4 4l → ZZ → H WW → H γ γ → H τ τ → H bb → H
L = 4.6-4.8 fb = 7 TeV s CMS,
= 119.5 GeV
H
m Combined (68%) Single channel
45